Hi
We are getting new heating installed.
Likely go with Viessmann - looking for set and forget, high efficiency, high comfort level, weather comp heating with high modulation ability x20 levels from 1.6kW to 35kW
--
Question is, what to choose: system boiler + unvented cylinder (180 litre), or the 111-W combi, with 46 litre internal hot water storage..
This will run 90 sq m UFH (maybe polypipe tray system above insulated suspended floor) to ground floor, and 6x radiators to first floor - 4 bedrooms + bathroom.
My gut feeling is that a system boiler gives advantages:
- 180 litres of pressurised indirect hot water at the ready when a power cut occurs.
- immersion heater in event that a boiler fault arises temporarily.
- an immersion heater to use 'free' electric from possible future solar PV (the price will come down, right?)
- a better match for the size of home, even if, usually, it will only be 2 occupants..
26kW or 35kW .. 50 sq m Gr floor extension will be well insulated modern design, insulated EPS block+beam floor, this is on the cold east/NE of building.. 20 sq m 1st floor extension will be well insulated design, this on the north of the building. Old roof will get a very thorough insulation fitted, with ventilated warm roof ridge/eaves.
Plan to use triple glazing to replace old failing DB glazing.
What do you think?
Thanks.
NB. Why don't online heat loss calc tools include options for triple glazing?
We are getting new heating installed.
Likely go with Viessmann - looking for set and forget, high efficiency, high comfort level, weather comp heating with high modulation ability x20 levels from 1.6kW to 35kW
--
Question is, what to choose: system boiler + unvented cylinder (180 litre), or the 111-W combi, with 46 litre internal hot water storage..
This will run 90 sq m UFH (maybe polypipe tray system above insulated suspended floor) to ground floor, and 6x radiators to first floor - 4 bedrooms + bathroom.
My gut feeling is that a system boiler gives advantages:
- 180 litres of pressurised indirect hot water at the ready when a power cut occurs.
- immersion heater in event that a boiler fault arises temporarily.
- an immersion heater to use 'free' electric from possible future solar PV (the price will come down, right?)
- a better match for the size of home, even if, usually, it will only be 2 occupants..
26kW or 35kW .. 50 sq m Gr floor extension will be well insulated modern design, insulated EPS block+beam floor, this is on the cold east/NE of building.. 20 sq m 1st floor extension will be well insulated design, this on the north of the building. Old roof will get a very thorough insulation fitted, with ventilated warm roof ridge/eaves.
Plan to use triple glazing to replace old failing DB glazing.
What do you think?
Thanks.
NB. Why don't online heat loss calc tools include options for triple glazing?